I have a wine cooler that I want to turn into a incubator. Normally I would built the controls from scratch but on this model if I can understand the controls there may be a simple fix.
boring info:
the cooler is 2 x peltier based it has 2 x 12v power supplys
one control board is basically a mosfet the other board and is hard wire slaved to the main board
on the main board with the dual op amp you have a mosfet that is being supplied by transistor that is connected with a few other compents to the dual op amp
there was a thermostat type device (may be just a pot) that you could select colder-hotter.
there is a temp sensors (2 wire)
the chip is 8 pin it looks like pins 1-2-3 are not connected (not soldered to the board)
on the print I think that means that
pin1 - 1 output
pin2 - 1 input -
pin3 - 1 input +
are not being used
so im guessing its being used as a single op amp really
pot I think following the traces is pin 5 via a reisitor listed as 2 input +
temp uses a few compents and seems to end at pin 6 listed as 2 input -
pin 7 is what interests me. Can I remove just the chip and connect the a arduino uno to control the mosfets / peltiers just by connecting the arduino to what use to be the 2 ouput pin on the chip and connecting the negatives between the power supply and the arduino
what kind of single would the op amp have been putting out to the mosfets (pwm or simple on off)
Any help or advice would be welcome (still trying to find a basic idiots guide to op amps)